Call front-end API from WD ABAP

Hi experts,
I'm trying to call font-end API (Destination: SAP_SSFATGUI) from webdynpro. It giving me communication_error but if i call it from ABAP its working. Pls help.

Hi,
I try to call API namely ssfrfc which is provided by SAP and located in SAPGUI dir in my desktop. You also will have this API program if you installed SAPGUI. When calling this API using call function....destination 'SAP_SSFATGUI' via WebDynpro ABAP it giving me communication_error . However no problem when using normal ABAP. Below are the coding.
METHOD onactionact_exe .
DATA:   ostr_output_data   TYPE ssfparms-outtext,
        ostr_output_data_l TYPE ssfparms-outtextlen,
        crc                TYPE ssfparms-ssfcrc,
        lv_sysubrc         type sysubrc.
call C function 'SSFVERSION'
CALL FUNCTION 'SSFVERSION' DESTINATION 'SAP_SSFATGUI'
    IMPORTING
      ostroutputdata        = ostr_output_data
      ostroutputdatal       = ostr_output_data_l
      crc                   = crc
    EXCEPTIONS
      communication_failure = 1
      system_failure        = 2.
lv_sysubrc = sy-subrc.
    write:/ OSTR_OUTPUT_DATA,
          / OSTR_OUTPUT_DATA_L,
          / CRC.

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